Final answer:
One similarity between the selections is that they both include observations about one person's unique contributions.
Step-by-step explanation:
One similarity between the selections is that they both include observations about one person's unique contributions. In both selections, there is a focus on the individual and their impact or experiences. For example, the first selection mentions the communication style of a blog attracting people of similar types, while the second selection discusses the harm caused by the advent of the digital age.